<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <Header :addTodoList="addTodoList" />
      <Content
        :todoList="todoList"
        :singleChange="singleChange"
        :singleDelete="singleDelete"
      />
      <Footer
        :todoList="todoList"
        :allChecked="allChecked"
        :clearComplate="clearComplate"
      />
    </div>
  </div>
</template>

<script>
import Content from "./components/Content";
import Footer from "./components/Footer";
import Header from "./components/Header";
export default {
  name: "App",
  components: {
    Content,
    Footer,
    Header,
  },
  data() {
    return {
      todoList: JSON.parse(localStorage.getItem("todoList")) || [],
    };
  },
  methods: {
    // 1.修改单个选中框
    singleChange(id) {
      // 匹配和id对应的数据,让done取反即可(因为列表的状态和done是对应的)
      this.todoList.forEach((item) => {
        if (item.id === id) {
          item.done = !item.done;
        }
      });
    },
    // 2.删除单个数据
    singleDelete(index) {
      //删除方法1：如果已知下标,并且只删除一个 可以直接使用splice进行删除即可
      this.todoList.splice(index, 1);
    },
    // 3.添加数据的方法
    addTodoList(newTodo) {
      this.todoList.unshift(newTodo);
    },
    // 4.全选的方法
    allChecked(newChecked) {
      this.todoList.forEach((item) => {
        item.done = newChecked;
      });
    },
    // 清除已完成
    clearComplate() {
      this.todoList = this.todoList.filter((item) => !item.done);
    },
  },
  //无论todoList发生如何的改变,我们都要做某件事件,则我们可以选择监听这个数据的变化
  watch: {
    todoList: {
      immediate: true,
      deep: true,
      handler() {
        localStorage.setItem("todoList", JSON.stringify(this.todoList || []));
      },
    },
  },
};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  /* display: inline-block; */
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

/*app*/
.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>
